If f(x) = -9x +3, find f(-5).

42

48

45

57

48

Step-by-step explanation:

You want to plug in -5 to replace x.

-9(-5) +3

multiply -9 times -5

keep in mind that when you multiply a negative number by a negative number, the product should be positive.

45 +3

add 45 and 3 and the answer should be 48. hope this helps

answer: finding the extract measurements and knowing the points

step-by-step explanation:

x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15